Correction to “Echinological Note” YI. 
By 
Dr. Th* Mortensen • 
In the “Echinological Note” VI. “Some abnormalities in Aster- 
oids and Ophiuroids” J ) I have described (p. 245, PI. IV. pjg-. 4 ) 
an abnormal specimen of Ceramctster (Pentagonaster) granularis, 
which shows, besides a double ambulacral furrow, the unusual feature 
of having pedicellariæ on some of the paxillæ of the dorsal side. 
I have thought it not unreasonable to see in this feature a case 
of atavism, as pedicellariæ are supposed otherwise not to occur in 
this species, whereas they occur normally in other species of this 
genus. It was the faet that all the other specimens examined by 
me had no pedicellariæ, which made me rely on the statement of 
\ er ri li * 2 ) 0 . a. that pedicellariæ do not normally occur in this 
species. But, of course, this is no excuse for my omitting to examine 
more thoroughly the litterature on this species. That pedicellariæ 
may occur in this species w r as observed by Ludwig (Seesterne 
des Mittelmeeres, 1897, p. 180) 3 4 5 ), and later on Gr i eg, in his 
“Michael Sars” Asteroidea I, p. 27*), found pedicellariæ to occur 
in nearly 10 °/o of the specimens from Norwegian Fjords. In a quite 
recently published paper “Bidrag til Kundskapen om Hardanger- 
fjordens Fauna” (p. 113)'«) Grieg has even found pedicellariæ to 
occur in nearly 50 °/o of the specimens from the locality Jondal 
in Hardangerfjord. Accordingly the suggestion that the presence 
of pedicellariæ in the abnormal specimen represents a case of ata¬ 
vism cannot be upheld. 
x ) Vid. Medd. Dansk Naturh. Foren. This voluine p. 241. 
2 ) A. E. Verril 1 . Revision of certain genera and species of Starfishes, 
with description of new forms. Transact. Connect. Acad. X. 1899. p. 16L 
) launa u, llora d. Golfes v. Neapel. Monogr. 24. 
4 ) Bergens Museums Aarbog. 1906. 
5 ) Ibidem. 
1918. 
Vidensk. Meddel, fra Dansk naturh. Foren. Bd. 65. 
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